Subject: [patch v11 14/23] ACPI / processor: Make it possible to get CPU hardware ID via GICC

From: [email-masked] (Catalin Marinas)
Date: Wed, 25 Mar 2015 17:25:52 +0000

On Tue, Mar 24, 2015 at 10:02:47PM +0800, Hanjun Guo wrote:
> Introduce a new function map_gicc_mpidr() to allow MPIDRs to be obtained
> from the GICC Structure introduced by ACPI 5.1, since MPIDR for ARM64 is
> 64-bit, so typedef u64 for phys_cpuid_t.
> 
> The ARM architecture defines the MPIDR register as the CPU hardware
> identifier. This patch adds the code infrastructure to retrieve the MPIDR
> values from the ARM ACPI GICC structure in order to look-up the kernel CPU
> hardware ids required by the ACPI core code to identify CPUs.
> 
> CC: Rafael J. Wysocki <[email-masked]>
> CC: Catalin Marinas <[email-masked]>
> CC: Will Deacon <[email-masked]>
> Tested-by: Suravee Suthikulpanit <[email-masked]>
> Tested-by: Yijing Wang <[email-masked]>
> Tested-by: Mark Langsdorf <[email-masked]>
> Tested-by: Jon Masters <[email-masked]>
> Tested-by: Timur Tabi <[email-masked]>
> Tested-by: Robert Richter <[email-masked]>
> Acked-by: Robert Richter <[email-masked]>
> Acked-by: Lorenzo Pieralisi <[email-masked]>
> Acked-by: Rafael J. Wysocki <[email-masked]>
> Reviewed-by: Grant Likely <[email-masked]>
> Signed-off-by: Hanjun Guo <[email-masked]>
> ---
>  arch/arm64/include/asm/acpi.h | 12 ++++++++++++
>  drivers/acpi/processor_core.c | 30 ++++++++++++++++++++++++++++++
>  2 files changed, 42 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index 9719921..eea0bc3 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -13,6 +13,8 @@
>  #define _ASM_ACPI_H
>  
>  #include <linux/mm.h>
> +#include <asm/cputype.h>
> +#include <asm/smp_plat.h>
>  
>  /* Basic configuration for ACPI */
>  #ifdef	CONFIG_ACPI
> @@ -27,6 +29,9 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
>  }
>  #define acpi_os_ioremap acpi_os_ioremap
>  
> +typedef u64 phys_cpuid_t;
> +#define PHYS_CPUID_INVALID INVALID_HWID
> +

This should have been defined in the previous patch (though it defaults
to -1, so not too bad).

Reviewed-by: Catalin Marinas <[email-masked]>